US7151645B2 - Interleaved repeatable runout estimation - Google Patents
Interleaved repeatable runout estimation Download PDFInfo
- Publication number
- US7151645B2 US7151645B2 US10/669,185 US66918503A US7151645B2 US 7151645 B2 US7151645 B2 US 7151645B2 US 66918503 A US66918503 A US 66918503A US 7151645 B2 US7151645 B2 US 7151645B2
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- United States
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- data
- position error
- head
- error signal
- repeatable runout
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
- G11B5/59627—Aligning for runout, eccentricity or offset compensation
Definitions
- a closed-loop track-following servo is sufficient for track following in the absence of major irregularities of the recording medium or drive mechanics.
- An entirely closed-loop system has a harder time correcting for larger and more abrupt irregularities.
- a combination of feedback and feedforward techniques can be employed to enhance the track-following ability of the servo control system.
- FIG. 2 is an exemplary top plan view of the printed circuit board of the exemplary disc drive of FIG. 1 .
- voice coil motor 32 rotates actuator arms 28 a–h during a contact stop operation, to position read/write heads 24 a–h over a respective one of landing zones 58 or 60 , where read/write heads 24 a–h come to rest on the storage disc surfaces.
- each of read/write heads 24 a–h is at rest on a respective one of landing zones 58 or 60 at the commencement of a contact start operation.
- Read/write control 36 includes a read channel that, in accordance with modern disc drive design, comprises an electronic circuit that detects information represented by magnetic transitions recorded on the disc surface within the radial extent of the selected data track. As described above, each data track is divided into a number of data sectors.
- a preferred embodiment of the present invention reduces the effect of NRRO on PES measurements by employing the general strategy of spacing the acquisition of repeated PES measurements over time so that PES measurements for a single recording surface and head are performing only in non-consecutive revolutions of the disc.
- a preferred embodiment of the present invention reduces the effects of NRRO by allowing sufficient time for the NRRO behavior to have shifted in phase with respect to the rotation of the disc. In the best case, the phase of the NRRO in non-consecutive revolutions becomes completely random, leading to accelerated convergence in the averaging process to the true value of the RRO. This technique is based on the observation that the same NRRO behavior does not occur repeatably at one given location on the disc at each revolution.
- the PES measurements collected for a particular head are averaged or otherwise combined to obtain a result that estimates the PES due to RRO only (i.e., without NRRO).
- a novel method and apparatus for estimating RRO in a disc drive are herein disclosed and characterized by steps of reading a position error signal of a first head for a first revolution of the disc drive to obtain first position error signal data; reading a position error signal of a second head for a second revolution of the disc drive to obtain second position error signal data, wherein the second revolution of the disc drive immediately follows the first revolution of the disc drive; reading a position error signal of the first head for a later revolution of the disc drive to obtain third position error signal data, wherein the later revolution of the disc drive occurs at a later time than the second revolution of the disc drive; and combining the first position error signal data with the third position error signal data to obtain an estimate of repeatable runout for the first head.
- the computer readable media may take the form of coded formats that are decoded for actual use in a particular data processing system.
- Functional descriptive material is information that imparts functionality to a machine.
- Functional descriptive material includes, but is not limited to, computer programs, instructions, rules, facts, definitions of computable functions, objects, and data structures.
Landscapes
- Moving Of The Head To Find And Align With The Track (AREA)
Abstract
Description
Claims (16)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/669,185 US7151645B2 (en) | 2003-09-23 | 2003-09-23 | Interleaved repeatable runout estimation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US10/669,185 US7151645B2 (en) | 2003-09-23 | 2003-09-23 | Interleaved repeatable runout estimation |
Publications (2)
Publication Number | Publication Date |
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US20050063086A1 US20050063086A1 (en) | 2005-03-24 |
US7151645B2 true US7151645B2 (en) | 2006-12-19 |
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US10/669,185 Expired - Fee Related US7151645B2 (en) | 2003-09-23 | 2003-09-23 | Interleaved repeatable runout estimation |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080225654A1 (en) * | 2007-03-14 | 2008-09-18 | Seagate Technology Llc | Zone based repeated runout error compensation |
US20090122440A1 (en) * | 2007-11-14 | 2009-05-14 | Seagate Technology Llc | Repeated runout error compensation using iterative feedback |
US20110283799A1 (en) * | 2008-11-03 | 2011-11-24 | Walter Franz De Odorico | Planar Probe Head and Ultrasonic Testing Device and Method for a Component |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7349172B2 (en) * | 2006-08-18 | 2008-03-25 | Seagate Technology Llc | Certifying concentric data in eccentric servo data tracks of pre-formatted media |
Citations (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4890172A (en) | 1988-09-27 | 1989-12-26 | Digital Equipment Corporation | Automatic servo gain calibration system for a disk drive |
US5227930A (en) | 1990-07-20 | 1993-07-13 | Quantum Corporation | Head position recalibration for disk drive |
US5550685A (en) | 1993-10-22 | 1996-08-27 | Syquest Technology, Inc. | Applying an adaptive feed-forward algorithm as a frequency selective filter in a closed loop disk drive servo system in order to compensate for periodic perturbations which otherwise appear in the servo system position error signal |
US5886846A (en) | 1996-03-13 | 1999-03-23 | Syquest Technology, Inc. | Method for applying optimal seeking technique to disk file with excessive repeatable runout |
US5995316A (en) * | 1997-08-29 | 1999-11-30 | Western Digital Corporation | initialization method and apparatus for a runout cancellation method |
US5999357A (en) | 1996-05-30 | 1999-12-07 | International Business Machines Corporation | Method and apparatus for spindle synchronization to reduce drive to drive runout |
US6005742A (en) | 1995-09-22 | 1999-12-21 | International Business Machines Corporation | Method and apparatus for controlling a multiple-stage actuator for a disk drive |
US6141175A (en) * | 1997-10-08 | 2000-10-31 | Western Digital Corporation | Repeatable runout cancellation in sectored servo disk drive positioning system |
US6167011A (en) | 1997-04-11 | 2000-12-26 | Oak Technology, Inc. | Processing of disc-drive pickup signals |
US6384994B1 (en) | 1996-01-02 | 2002-05-07 | International Business Machines Corporation | Method for positioning a magnetoresistive head using a thermal response to servo information on the record medium |
US6421200B2 (en) | 1998-06-30 | 2002-07-16 | Fujitsu Limited | Control method and control device for a disk storage device |
US6437936B1 (en) * | 1999-07-23 | 2002-08-20 | Seagate Technology Llc | Repeatable runout compensation using a learning algorithm with scheduled parameters |
US6445531B1 (en) | 1998-10-09 | 2002-09-03 | Seagate Technology Llc | Disc drive method and apparatus for dynamically adjusting seek operations |
US6476995B1 (en) | 1999-01-15 | 2002-11-05 | Seagate Technology Llc | Method and apparatus for reducing track misregistration from servo track writing |
US6510015B2 (en) | 1999-12-10 | 2003-01-21 | Seagate Technology Llc | Magnetic disc having physical servo patterns with a magnetic carrier, and method of making and using the same |
US6549362B1 (en) | 2000-06-09 | 2003-04-15 | Maxtor Corporation | Method and apparatus for the enhancement of embedded runout correction in a disk drive |
US6707635B1 (en) * | 2000-10-05 | 2004-03-16 | Western Digital Technologies, Inc. | Method and apparatus for RRO learning on alternate tracks before and after shipping to cancel RRO in a disk drive |
US6785084B2 (en) * | 2000-10-24 | 2004-08-31 | Seagate Technology Llc | Correction of dynamic track spacing errors in storage devices |
-
2003
- 2003-09-23 US US10/669,185 patent/US7151645B2/en not_active Expired - Fee Related
Patent Citations (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4890172A (en) | 1988-09-27 | 1989-12-26 | Digital Equipment Corporation | Automatic servo gain calibration system for a disk drive |
US5227930A (en) | 1990-07-20 | 1993-07-13 | Quantum Corporation | Head position recalibration for disk drive |
US5550685A (en) | 1993-10-22 | 1996-08-27 | Syquest Technology, Inc. | Applying an adaptive feed-forward algorithm as a frequency selective filter in a closed loop disk drive servo system in order to compensate for periodic perturbations which otherwise appear in the servo system position error signal |
US6005742A (en) | 1995-09-22 | 1999-12-21 | International Business Machines Corporation | Method and apparatus for controlling a multiple-stage actuator for a disk drive |
US6384994B1 (en) | 1996-01-02 | 2002-05-07 | International Business Machines Corporation | Method for positioning a magnetoresistive head using a thermal response to servo information on the record medium |
US5886846A (en) | 1996-03-13 | 1999-03-23 | Syquest Technology, Inc. | Method for applying optimal seeking technique to disk file with excessive repeatable runout |
US5999357A (en) | 1996-05-30 | 1999-12-07 | International Business Machines Corporation | Method and apparatus for spindle synchronization to reduce drive to drive runout |
US6167011A (en) | 1997-04-11 | 2000-12-26 | Oak Technology, Inc. | Processing of disc-drive pickup signals |
US5995316A (en) * | 1997-08-29 | 1999-11-30 | Western Digital Corporation | initialization method and apparatus for a runout cancellation method |
US6141175A (en) * | 1997-10-08 | 2000-10-31 | Western Digital Corporation | Repeatable runout cancellation in sectored servo disk drive positioning system |
US6421200B2 (en) | 1998-06-30 | 2002-07-16 | Fujitsu Limited | Control method and control device for a disk storage device |
US6445531B1 (en) | 1998-10-09 | 2002-09-03 | Seagate Technology Llc | Disc drive method and apparatus for dynamically adjusting seek operations |
US6476995B1 (en) | 1999-01-15 | 2002-11-05 | Seagate Technology Llc | Method and apparatus for reducing track misregistration from servo track writing |
US6437936B1 (en) * | 1999-07-23 | 2002-08-20 | Seagate Technology Llc | Repeatable runout compensation using a learning algorithm with scheduled parameters |
US6510015B2 (en) | 1999-12-10 | 2003-01-21 | Seagate Technology Llc | Magnetic disc having physical servo patterns with a magnetic carrier, and method of making and using the same |
US6549362B1 (en) | 2000-06-09 | 2003-04-15 | Maxtor Corporation | Method and apparatus for the enhancement of embedded runout correction in a disk drive |
US6707635B1 (en) * | 2000-10-05 | 2004-03-16 | Western Digital Technologies, Inc. | Method and apparatus for RRO learning on alternate tracks before and after shipping to cancel RRO in a disk drive |
US6785084B2 (en) * | 2000-10-24 | 2004-08-31 | Seagate Technology Llc | Correction of dynamic track spacing errors in storage devices |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080225654A1 (en) * | 2007-03-14 | 2008-09-18 | Seagate Technology Llc | Zone based repeated runout error compensation |
US7589930B2 (en) | 2007-03-14 | 2009-09-15 | Seagate Technology Llc | Zone based repeated runout error compensation |
US20090122440A1 (en) * | 2007-11-14 | 2009-05-14 | Seagate Technology Llc | Repeated runout error compensation using iterative feedback |
US7889453B2 (en) * | 2007-11-14 | 2011-02-15 | Seagate Technology Llc | Repeated runout error compensation using iterative feedback |
US20110283799A1 (en) * | 2008-11-03 | 2011-11-24 | Walter Franz De Odorico | Planar Probe Head and Ultrasonic Testing Device and Method for a Component |
US8650959B2 (en) * | 2008-11-03 | 2014-02-18 | GE Sensing & Inspection Technologies | Planar probe head and ultrasonic testing device and method for a component |
Also Published As
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US20050063086A1 (en) | 2005-03-24 |
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